Refractory burner throat



March 5, 1940. A. w. ANDERSON REFRACTORY BURNER THROAT Fi led Nov. 16, 1938 Patented Mar. 5, 1940 UNITED STATES PATENT OFFICE REFRACTORY BURNER THROAT v Arleigh w. Anderson, Huntington Park, CaliL, assignor to Peabody Engineering Corporation, New York, N. Y., a corporation of New York Application November 16, 1938, Serial No. 240,609

8 Claims. (Cl. 110-1) arranged that the replacement of the individual blocks is facilitated.

Another object is to provide a sectional refractb tory block having a nose section which may be removed and replaced without replacing the entire blooh.

Another object is to provide novel and improved means for securing the nose section in it the furnace wall.

Another object is to provide means for secur-- ing the nose section without the use of extra bolts or stays. 1 Another object is to provide a block for a no burner throat having a nose .section loosely held so as to permit expansion or distortion thereof due to the heat of the flame.

Another object is to provide novel and improved means for securing the blocks in the furtt nace wall.

Various other objects and advantages will be, apparent as the nature of the invention "is more fully disclosed.

Although the novel features which are bedd lieved to be characteristic of this invention will be more particularly pointed out in the claims appended hereto, the invention itself will be better understood by referring to the following description, taken in connection with the ac- 3A companying drawing forming a part thereof, in which a specific embodiment of the invention has been set forth for purposes of illustration.

In the drawing: Fig. l is a side elevation, partly in section, of a W burner assembly embodying the present invention;

Fig. 2 is a front elevation thereof talgen from within the combustion chamber; and v Fig. 3 is a detail view of the securing bolt for it the blocks. v

. In the following description and in the claims certain specific terms are used for convenience in referring to various details of the invention. These terms, however, are to be given as broad an interpretation as the'stateof the art will permit.

Referring more particularly to the drawing,

the invention is shown as applied to afurnace wall it forming a part of the combustion chamber of a furnace of any well known and standard construction. The wall it is provided with a circular opening H in which the burner throat blocks are positioned. The burner throat is formed by a ring of sectional refractory blocks if, each block comprising a base section Ma and a nose section l2b having cooperating dovetailed shoulders i l and I5 respectively which serve to hold the nose sections l2b in position. The blocks l2 are each provided with a curved inner surface is which is suitably shaped to form the usual flared burner throat. In the embodiment shown, the nose section lZb is provided with a surface i 'll extending from the shoulder l5 radially to the outer edge of the block and with an inclined surface I8 extending from the shoulder it to, the inner curved surface it of the block. The base section We is provided with complementai'y surfaces which engage the surfaces ii and id for securing and supporting thev nose section. The inclined surface it provides a wedge shaped support which wedges the nose section against the inner peripheral surface of the wall III at the opening Ii. The transverse surface l'l positions the block axially. The peripheral surface of the nose section iscurved as at itabout the point 20 as a center to permit the nose section to pivot about said point, as shown in dotted lines in Fig. 1, for removal from the assembly without disturbing the base section. The inner peripheral surface of the wall It at the opening it. engaging the outer peripheral siuface of the nose sections i2b, serves to securely hold the same while the burner is being operatmu For securing the blocks in position and supporting the air register, to be described, there may be provided a plate 2|, having an opening 22 registering with the burner throat. The plate it may be secured by any suitable means such as the boiler columns (not shown). A sheet 21a of insulating material may be disposed beneath the plate 2i if desired.

The base sections He: may be provided with recesses 23 forming a continuous annular recess around the entire ring of blocks. A set of hoebolts 25 having heads 25 extend through the plate 2i and'are secured thereto as by nuts 26 with the heads 25 in the recesses 23. The bolts it may be spaced around the opening ll so that the heads it form a substantially continuous supporting ring for the refractory blocks 12. The plate It may overlap the opening ii to forms. flange 21 which-serves as a stop and positioning means for the blocks I2. The peripheral surface 28 of the base sections I20. is spaced from the inner surface of the wall It at theopening l I to provide an annular channel in which the bolts 24 may be positioned.

An air register may besecured to the plate 2|, as by means of an annular support 3| forming a part of the air register and having a flange 32 secured to the plate 2| by bolts 33. The air register may be of any standard construction and may comprise, in general, a plurality of peripheral doors 34 which are provided with suitable actuating mechanism and are supported between the annular member 3| and a front plate 35. The front plate 35 may be secured in a rectangular frame 36 attached to a wall 31 forming, with the wall Ill, an air space through which air is supplied to the air register 30. It is to be understood that when used with natural draft the wall 31 may be omitted and when used with forced draft the air register may be supported by the wall 31 in whichcase the bolts 33 may beomitted. A burner barrel 40' of standard construction, provided with an atomizer tip 4| and a diffuser 42, may be carried by the front plate 35 in a position to extend axially of the burner throat for supplying fuel in the form of a cone-shaped spray which combines with the air from the register 30 for combustion purposes. Any standard type of air register and burner may be employed, such, for

example, as that described more in detail in the Peabody Patent 1,628,424. The air register may be adapted to produce a rotating mass of air which is fed inwardly through the burner throat and is diffused by the diffuser 42 so asto effect complete combustion. The burner may, of course, be adapted for use with various types of fuel, such as, for example, solid, liquid or gaseous fuel and is' adapted to produce a cone-shaped flame which extends inwardly within the combustion chamber of the furnace.

. The nose sections l2b of the throat blocks are subjected to the intense heat of the flame. Hence this portion of the blocks deteriorates most rapidly. Furthermore, it is subjected to extreme temperature changes which cause contraction and expansion thereof and frequently result in the cracking of the blocks. The present invention permits the nose sections to be made of a higher grade refractory than the base sections if desired and also permits the .nose sections to 'be replaced without requiring replacement of the entire block.

The throat is assembled in the usual manner, the blocks l2 being secured by the bolts 24 and the recesses being filled with plastic refractory if desired. Inasmuch as the nose sections I2b are securely held by the cooperating surfaces of the bases l2a and the inner surface of the opening ll inthe wall I, no additional fastening means for'the nose sections is required. They may be readily removed in the manner above described without removing or loosening the base sections.

It is to be understood that the nose sections may be held by plastic refractory if desired. In removing the nose sections it may be necessary to break away one of the sectionsto release the others which are held by the keystone effect thereof. The last section may be inserted by removing the shoulder l5 thereof and sliding'the section in axially from the inside of the furnace,

using plastic refractory if desired to secure the .same.

I The surfaces l1 and iii are preferably provided with suflicient clearance so that a limited amount of movement is permitted for the nose sections |2b. This permits the nose sections to freely 'expand and contract in response to temperature changes and to automatically position themselves so as to equalize the stresses produced therein. In this way the life of the blocks is materially increased.

It is to be. understood that the shape of the flared surface I6 of the blocks I2 may be varied in accordance with the particular type of burner and with the particular fuel being employed so as to produce a flame having the-desired characteristics. Any desired type of supporting means may be employedfof securing the base sections, the bolts 24 having been shown only for purposes of illustration. It is to be understood that the bolts 24 may be omitted if desired and the blocks secured by the plastic refractory or by the close fit of the various blocks in the ring. In certain instances means may be provided for admitting air to the space around the blocks. This air passes through the openings around and between the blocks and'between the base and nose sections and thereby cools the blocks and increases the life thereof.

Although a specific embodiment of the invention has been shown, it is to be understood that the invention is capable of various uses and that various changes and modifications may be made therein as will readily appear to a person skilled in the art. The invention is only to be limited in accordance with the following claims when interpreted in view of the prior art.

What is claimed is: I

1. In a furnace having a wall provided with an opening, a ring of sectional blocks in said opening forming a burner throat, each of said blocks comprising separate base and nose sections, means securing said base sections to said wall, said base and nose sections having shoulders formed thereon in dovetailed relationship to hold the nose sections in position against the inner peripheral surface of the wall at said opening, said shoulders being arranged to release the nose sections when the nose sections are tilted inwardly.

2. In a furnace having a wall provided with an opening, a ring of sectional blocks in said opening forming a burner throat, each of said blocks comprising separate base and nose sections, means securing said base sections to said wall, said base and nose sections having interlocked shoulders and having complementary surfaces extending from said shoulders to the inner peripheral surfaces of the blocks, said complementary surfaces being inclined to wedge the nose sections against thev inner peripheral surface of said wall at said opening.

3. In a furnace having a wall provided with an opening, a ring of sectional blocks in said opening forming a burner throat, each of said blocks comprising separate base and nose sections, means securing said base sections to said wall, said base and nose sections having interlocked shoulders and having complementary surfaces extending from said shoulders to the inner and outer peripheral surfaces respectively of the blocks, the first complementary surfaces beingring of sectional blocks each having a base section adapted to form the outer part of said throat and a separable nose section forming the inner part of said throat, said base and nose sections having interlocked shoulders holding the nose sections in position, said nose sections having a curved rear peripheral surface to permit removal thereof by tilting their forward ends inwardly-toward the axis of the burner throat.

5. In a furnace having a wall provided with an opening, a ring of refractory blocks in said opening forming a burner throat, said blocks having an outer annular groove extending around said ring and having longitudinal channels extending from the front of said blocks into communication with said groove and securing means for said blocks comprising bolts in said channels and having headsextending into said groove. 6. In a furnace having a wall provided with an opening, a ring of refractory blocks in said channel and having heads extending into said groove.

7. In a furnace having a wall provided with an opening, a ring of sectional blocks' in said opening forming a burner throat, each of said blocks comprising separate base and nose sections, means securing said base sections in said wall opening, said base and nose sections having interlocking surfaces removably securing said nose sections to said base sections and holdin the same in position against the inner periphery of said wall opening whereby said securing means serves tosecure both the base and nose sections in said wall and whereby said nose sections may be removed without releasing said securing,

means.

8. The invention set forth in claim 7 in which said nose sections are each provided 'with an arcuate rear peripheral surface cooperating with said interlocking surfaces to permit removal of the nose sections without disturbing said base sections by tilting the forward ends thereof inwardly toward the axis of the burner throat.

ARLEIGH W. ANDERSON. 

